Glossary

Centrally put together, the glossary comprises of terms and definitions from Henkel’s adhesive experts. Browse through our comprehensive knowledge pool and broaden your understanding about important hygiene, nonwoven and tissue related topics.


A-I J-R S-Z
Adhesion, adhesive,
adhesive failure, bleed
through, CEPI...

Machinability, open time, rheology...

Set speed, shear resistance,
softening point, tack...



Adhesion

The Adherence of like or different materials with one another.*
Source: Adhesive Technology – Basic Principles, Hermann Onusseit, Beuth Verlag 2012

 
Adhesive

Adhesive binding is one of the most important joining processes with which different materials, whether the same type or different, are combined without structural changes to the joining partners. Adhesive is the word used to describe the process material used for this type of joining. In accordance with DIN EN 923 (2008:06), an adhesive is defined as a “non-metallic substance capable of joining materials by surface bonding in such a way that the bond possesses adequate internal strength.*
Source: Adhesive Technology – Basic Principles, Hermann Onusseit, Beuth Verlag 2012

 
Adhesive failure

Either the adhesive separates from the substrate or the adhesive itself is breaking apart.

 

Bleed through

The migration of an adhesive through a substrate.

 

CEPI

CEPI is the Confederation of European Paper Industries.

 
CNHPIA
CNHPIA is the China National Household Paper Industry Association. 
CNIT

CNIT is the China Nonwovens & Industrial Textiles Association.

 
Cohesion

The internal strength of any materials is refered to as cohesion. While ideal gases exhibit no cohesion and liquids very little, solids are distinguished in part by very high cohesion values.*
Source: Adhesive Technology – Basic Principles, Hermann Onusseit, Beuth Verlag 2012

 
Cohesive failure

Loss of bond from the strength of the adhesive. Typically adhesive is on both substrates.

 

EDANA

EDANA is a leading global association and voice of the nonwovens and related industries.

 
Emulsion

A dispersion or suspension of solid, insoluble particles in water.

 
ETS

ETS is short for the European Tissue Symposium.

 

Glass transition temperature

The temperature at which a polymeric material changes from a crystalline structure to an amorphous structure.

 

Hotmelt

Adhesives which are melted for the application (coating and wetting) and return into crystalline and amorphous solids during setting by cooling. Hotmelt adhesives are free of solvents, meaning that all components remain in the glue line after application. They are solid at room temperature.*
Source: Adhesive Technology – Basic Principles, Hermann Onusseit, Beuth Verlag 2012

 

INDA

INDA is the Association of the Nonwoven Fabrics Industry.

 


Machinability

General term on how “cleanly” an adhesive runs on application equipment.

 

Open time

The time an adhesive is still able to bond two substrates together.

 

Rheology

Rheology is a branch of mechanics and involves the deformation and flowing of materials. It describes how bodies, particularly fluids and gases but also solids, deform under loading of external forces.*
Source: Adhesive Technology – Basic Principles, Hermann Onusseit, Beuth Verlag 2012

 


Setting speed

Upon compression, the time necessary to obtain a fiber tearing bond (adhesive becomes stronger than the substrate).

 
Shear resistance

Evaluation of the cohesiveness of hot melt film under temperature and shear conditions.

 
Softening point

The temperature at which the adhesive starts to soften and does not hold its shape.

 

Tack

Strength of the initial adhesion of an adhesive directly after application or after joining. The value of the initial adhesion of an adhesive strongly depends upon temperature, pressure, layer thickness and surface properties of the adherends.*
Source: Adhesive Technology – Basic Principles, Hermann Onusseit, Beuth Verlag 2012

 
Tensile strength

The maximum stress a material subjected to stretching can withstand without breaking.

 
Tensile yield

The maximum stress that can be applied without permanent deterioration.

 
Thermal stability

The time period an adhesive remains stable without severe degradation related to char, skinning, viscosity change & etc.

 
Transfer

Normally refers to “adhesive transfer” with the adhesive moves from its proper place to some other position or substrate during removal.

 

Ultimate tensile

In a tension test, the ultimate tensile (strength) is the maximum amount of stress a specimen can withstand before breaking.

 

Viscosity

The measurement of the resistance to flow of a liquid substance.

 

Wettability

An adhesive’s ability to wet out a surface. This is impacted by rheology and surface energies of the adhesive.

 

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